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From: Hannes Reinecke <hare@suse.de>
To: John Garry <john.garry@huawei.com>, axboe@kernel.dk
Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	ming.lei@redhat.com, linux-scsi@vger.kernel.org
Subject: Re: [PATCH RESEND v3 01/13] blk-mq: Change rqs check in blk_mq_free_rqs()
Date: Tue, 14 Sep 2021 07:35:48 +0200	[thread overview]
Message-ID: <7a75a9e0-5467-e4fa-d059-8154f5568854@suse.de> (raw)
In-Reply-To: <1631545950-56586-2-git-send-email-john.garry@huawei.com>

On 9/13/21 5:12 PM, John Garry wrote:
> The original code in commit 24d2f90309b23 ("blk-mq: split out tag
> initialization, support shared tags") would check tags->rqs is non-NULL and
> then dereference tags->rqs[].
> 
> Then in commit 2af8cbe30531 ("blk-mq: split tag ->rqs[] into two"), we
> started to dereference tags->static_rqs[], but continued to check non-NULL
> tags->rqs.
> 
> Check tags->static_rqs as non-NULL instead, which is more logical.
> 
> Signed-off-by: John Garry <john.garry@huawei.com>
> Reviewed-by: Ming Lei <ming.lei@redhat.com>
> ---
>   block/blk-mq.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 108a352051be..2316ff27c1f5 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -2340,7 +2340,7 @@ void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
>   {
>   	struct page *page;
>   
> -	if (tags->rqs && set->ops->exit_request) {
> +	if (tags->static_rqs && set->ops->exit_request) {
>   		int i;
>   
>   		for (i = 0; i < tags->nr_tags; i++) {
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer

  reply	other threads:[~2021-09-14  5:35 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13 15:12 [PATCH RESEND v3 00/13] blk-mq: Reduce static requests memory footprint for shared sbitmap John Garry
2021-09-13 15:12 ` [PATCH RESEND v3 01/13] blk-mq: Change rqs check in blk_mq_free_rqs() John Garry
2021-09-14  5:35   ` Hannes Reinecke [this message]
2021-09-13 15:12 ` [PATCH RESEND v3 02/13] block: Rename BLKDEV_MAX_RQ -> BLKDEV_DEFAULT_RQ John Garry
2021-09-14  5:36   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 03/13] blk-mq: Relocate shared sbitmap resize in blk_mq_update_nr_requests() John Garry
2021-09-14  5:37   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 04/13] blk-mq: Invert check " John Garry
2021-09-14  5:38   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 05/13] blk-mq-sched: Rename blk_mq_sched_alloc_{tags -> map_and_rqs}() John Garry
2021-09-14  5:40   ` Hannes Reinecke
2021-09-14  8:10     ` John Garry
2021-09-13 15:12 ` [PATCH RESEND v3 06/13] blk-mq-sched: Rename blk_mq_sched_free_{requests -> rqs}() John Garry
2021-09-14  5:41   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 07/13] blk-mq: Pass driver tags to blk_mq_clear_rq_mapping() John Garry
2021-09-14  5:44   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 08/13] blk-mq: Don't clear driver tags own mapping John Garry
2021-09-14  5:45   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 09/13] blk-mq: Add blk_mq_tag_update_sched_shared_sbitmap() John Garry
2021-09-14  5:46   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 10/13] blk-mq: Add blk_mq_alloc_map_and_rqs() John Garry
2021-09-14  5:48   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 11/13] blk-mq: Refactor and rename blk_mq_free_map_and_{requests->rqs}() John Garry
2021-09-14  5:50   ` Hannes Reinecke
2021-09-13 15:12 ` [PATCH RESEND v3 12/13] blk-mq: Use shared tags for shared sbitmap support John Garry
2021-09-14  6:04   ` Hannes Reinecke
2021-09-14  8:27     ` John Garry
2021-09-13 15:12 ` [PATCH RESEND v3 13/13] blk-mq: Stop using pointers for blk_mq_tags bitmap tags John Garry
2021-09-14  6:05   ` Hannes Reinecke
2021-09-20  7:45 ` [PATCH RESEND v3 00/13] blk-mq: Reduce static requests memory footprint for shared sbitmap John Garry

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